245/60/15 on a 15X7 ralley is about the widest with no interference, but 245's are non-exsistant today,...255/60/15 will "just" rub the inner rails in a full lock turn,...I got GoodYear Eagle II 255/60/15 up front and 275/60/15 out back, 275/60 is right at the rear qtrs lip edge and about 1/2" clearance between the rear spring and tire, no rubbing, but real close!